ECET 340 Week 3 Homework

ECET340

Pages 323-325, problems 1-7, 10a, 20, 25, 29, 32

1.How many free-running timers do we have in the HCS12?

2.TCNT of the HCS12 is ____-bit.

3.For accurate reading, the TCNT is accessed as (8-bit, 16-bit).

4.The free-running timer supports a highest prescaler value of ______.

5.The free-running timer supports a lowest prescaler value of ______.

6.Which register holds the TOF?

7.How do we enable the free-running timer?

10. Find the frequency and period used by the free-running timer if the crystal attached to the HCS12 has the following values:

(a) XTAL = 4 MHz

20. Assume that XTAL = 4 MHz. Find the value needed to generate a time delay of 5 ms. Use the largest prescaler possible.

25. Program channel 2 for Output Compare to generate a square wave of 1 kHz with 50% duty cycle. Assume that XTAL = 4 MHz.

29. Explain the role of the TIOS register for the Input Capture function.

32. Explain the role of TCTL3 and TCLT4 in Input Capture function programming.

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